CODEWITHSUNDEEP
c++qtdata-structuresqlist
Tomás Juárez
Tomás Juárez

Reputation: 1514

Bad calling of QList::push_back()

I'm trying to insert a QList in another QList, but I'm getting the following error: 

parser.y:40: error: no matching function for call to 'QList<QList<QString> >::insert(QList<QList<QString> >&)'

Trying to push a QList called partialFormula into another QList called formula:

formula.push_back(partialFormula);

I think my error is in the definition of my QList templates, because the expected value of the formula QList is a QList of QString, but I'm trying to insert a QList of QList of QString.

QList<QList<QString> > formula;
QList<QList<QString> > partialFormula;
formula.push_back(partialFormula); //error.

Also, I want to insert in partialFormula another QList >, and so on..., Do I have to create a class or a struct?

What can I do to do this?

My code:

#include <QList>
#include <QString>

int main () {
    QList<QList<QString> > formula;
    QList<QList<QString> > partialFormula;
    QList<QString> atomicCondition;

    //It works!
    partialFormula.push_back(atomicCondition);
    //It does not work.
    formula.push_back(partialFormula);

    return 0;
}

Thanks!

Upvotes: 0

Views: 1156

Answers (2)

Robert
Robert

Reputation: 1343

The push_back function is only there for STL-compatibility reasons and accepts only appending of variables of type T in your case QString. Have a look here: QT Doc

Try using one of the following:

formula.append(partialFormula);

or

formula += partialFormula;

or

formula << partialFormula;

or

formula.insert(formula.size(), partialFormula);

Upvotes: 1

Steffen
Steffen

Reputation: 2948

If you want to append another QList of the same type, you can use the += operator:

formula += partialFormula;

Upvotes: 0

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